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"Orange spots that form on the bottom or the underside of the leaves are hydrangea rust," read Epic Gardening's hydrangea guide. "The top of the leaf will turn yellow and the leaf will eventually die.
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Guttation is the exudation of drops of xylem and phloem sap on the tips or edges of leaves of some vascular plants, such as grasses, and also a number of fungi. Ancient Latin gutta means "a drop of fluid", whence modern botany formed the word guttation to designate that a plant exudes drops of fluid onto the outer surface of the plant, when the ...
This article is a list of diseases of hydrangeas (Hydrangea macrophylla ... Pseudomonas solanacearum: Bacterial leaf spot Pseudomonas cichorii: Fungal diseases ...
Leaf spots can vary in size, shape, and color depending on the age and type of the cause or pathogen. Plants, shrubs and trees are weakened by the spots on the leaves as they reduce available foliar space for photosynthesis. Other forms of leaf spot diseases include leaf rust, downy mildew and blights. [4]
Peegee hydrangea (Hydrangea paniculata): These are the easiest type to grow and are extremely cold-hardy. Annabelle hydrangea (Hydrangea arborescens): These are native to North America and cold hardy.
Alternaria leaf spot or Alternaria leaf blight are a group of fungal diseases in plants, that have a variety of hosts. [ 1 ] [ 2 ] [ 3 ] The diseases infects common garden plants, such as cabbage, and are caused by several closely related species of fungi. [ 4 ]